Method of manufacturing veneered metal surfaces



June 16, 1931. M, NE; 1,810,281?" METHOD OF MANUFACTURING VENEEfiED IETAL SURFACES Filed Jan. 11. 1929 v Patented June 16, 1931 umrso srArEs ,PA'TENT OFFICE.

MAX LINSE, F BEBLIN-BIESDpRF-SUD, GERMANY, ,ASSIGNOR T0 ERWIN O. ETABERFELD,

0F BERLIN,

METHOD OF .MANUFACTURING Application filed January 11, 1929, Serial No.

Many articles of equipment for ofiices and the like, for instance wardrobes, card-index boxes, frames and various sorts of furniture, are made of cast or sheet-iron, the reasons being chiefly fire-proof condition, simplicity, cheapness, and great strength. Iron articles, however, require careful painting from time to time as a prevention from rust, and a drawback consists in the prosy or too severely plain appearance of iron furniture. The

manufacture of fireproof furniture of a good appearance from a ply material of metal covered with a, wood veneer is desirable, but making a ply material of metal and wood has 1 heretofore met with diificulties,particularly with regard to obtaining a permanent ce-- menting union between wood and iron.

The present invention relates to a method of producing a union of the required quality, the woodbeing employed in the form of veneers and the method. consisting in covering the metal surface to which the veneer is n to be applied with a sizing coating composed of casein, talc, and a small addition of slacked lime, allowing such coating to dry. or drying it artificially,and then aflixin'g thereon the veneer by means of a good glue, preferably leather glue; The veneering procedure is. practically the same as with the veneering of wood, and also the samepresses can be used for carrying out the process. This proc ess renders it possible to manufacture veneerediron furnitures, and the like and to afford the respective furniture and the other articles a neater appearance than they other wise would have. It is, however, possible to produce merely veneeredvsheet-metal plates and to use them in many ways, for instance as door panels-which cannot then be cutout of the door althoughthey look like panels of "wood. v 4 Itis desirableto clean carefully the metal surface to be veneered prior to applying the sizing composition, especially for the purpose of removing scale and the like, and it is also desirable to roughen the surface, for instance by passing the sheet-metal between suitable rollers acting to abrade the metal or impart 50 thereto such unevenesses as can be produced GEIRJYIA1\T'SZ VENEERED METAL SURFACES 331,956, and in Germany January 18, 1928.

by means of coarse emery or by rough grind- As the composition consists of equal parts of casein and tale, with a small addition of pulverulent slacked lime, it is not affected by the usuallyexisting or occurring temperatures. When it has become dry, it presents a highly clinging or adhering foundation sizing layer for the wooden veneer which, by the use of a' suitable glue, may be firmlyisecured to the metal in such manner as to form a facing which will not come loose or become 'deleteriously affected by climatic changes.

Although'I have spoken of wooden veneers,

still, I wish it to be understood that also other.

suitable natural or artificial materials to'be had or produced in veneer-like thinness can be used as coverings for the sheet-iron articles whatever they may be. I mention artificial resins by way of example. It is in this way possible to produce very tasteful effects also as regards oflice furniturand the like with only a comparatively smallfconsumption of only comparatively expensive materials, such as good veneers of wood or another natural or artificial material or'compositiom In some cases it may be advisable tovary the portions of casein, talc and slacked lime in the adhesive. For example, 2 parts of casein,

1 part of talc, and 1 part of slacked lime will give a good sizing adhesive. It may be fur ther advisable to add to the glue part talc or pulverized steatite, say 10% to increase the adhesive action of the glue to the metal surface. For thoroughly cleansing the metal surface before applying the adhesive, the surface may be rubbed with slacked lime dissolved in water, andthen wiped off.

The accompanying drawing shows in cross section a plysheet embodying my invention and comprising a metallic sheet at having a sizing coating composition 72 of caseln, tale 1. and slacked; lime applied to its outer face, and

a wood veneer sheet d provided on its inner face with a glue coat 0 whereby it is secured the sizing coat 6.

I claim:

1. The method of applying wood veneer to metal surfaces, .conslsting in covering the metal surface with a composition of casein,

talc, and slacked lime, letting said covering dry, and affixing the veneer thereon by means of glue.

2. The method of applying wood veneer to metal surfaces, consisting in removing any adhering scale from the surface of the metal, covering it with a com osition of casein and talc with a small addition of slacked lime, letting said covering dry, and aflixing the veneer thereon by means of glue.

3. The method of applying wood veneer to metal surfaces, consisting in cleaning and 'roughening the metal surfaceycovering it with a composition of casein, talc, and slacked lime, lettin said covering dry, and aflixing the veneer t ereon by means of glue.

4. The method of applying wood veneerv to metal surfaces, consisting in removing any adhering scale from the metal surface, roughening it, covering it with a composition of equal parts of casein and talc and,a small amount of slacked lime, letting said cover- 4 ing dry, and aifixing the veneer thereon by means of glue.

5. The method of applying wood veneer to metal surfaces, consisting of cleansing the metal surface, covering it with a composltion of casein, talc and slacked lime, letting said covering dry, and affixing the veneer thereon byl means of glue containing an addition of ta 0.

6. The method of applying wood veneer to a metal surface, which consists in coating the metal surface with a binder com osition of casein and lime together withta c in quantity corresponding substantially to that of the casein, and then gluing the veneer to the binder coating. r

7. A composite ply material comprising metal having a binder coating of casein, limeand talc, and wood veneer glued to said binder coating.

In testimony whereof 1% afiix my signature.

" MAX LINSE. 

